Butters ribs (4)
I believe the answer is:
kids
This clue is a double definition.
'butters' is the first definition.
(young goats, animals which butt)
'ribs' is the second definition.
(both can mean to mock or tease)
(Other definitions for kids that I've seen before include "fools" , "Teases" , "Young goats" , "They make immature butts" , "Children" .)